Apple TV release Slow Horses Season 4 trailer
Apple TV has officially unveiled the trailer for the upcoming sixth season of its Emmy and BAFTA TV Award-winning espionage drama, Slow Horses.
Apple TV has officially unveiled the trailer for the upcoming sixth season of its Emmy and BAFTA TV Award-winning espionage drama, Slow Horses. The six-episode season is set to premiere globally on Wednesday, September 16, 2026, with new episodes dropping weekly every Wednesday through October 21.
Sir Gary Oldman returns as the cantankerous Jackson Lamb, leading the dysfunctional MI5 rejects of Slough House. In addition to the returning core cast, fan-favorite Olivia Cooke will reprise her role as Sidonie “Sid” Baker for the first time since season one, alongside series newcomer and BAFTA TV Award winner Lenny Rush.
Season 6 Overview & Schedule
Premiere Date: Wednesday, September 16, 2026 (Episode 1)
Finale Date: Wednesday, October 21, 2026
Platform: Apple TV (Global)
Adapted Books: Joe Country and Slough House (Novels 6 & 7 by Mick Herron)
Director: Adam Randall
Head Writer / Adapter: Gaby Chiappe
Plot & Key Cast
Season six sees the Slow Horses forced on the run after MI5 Second Desk Diana Taverner (Kristin Scott Thomas) embroils the Slough House team in a high-stakes web of retaliation and revenge.
Alongside Oldman, Scott Thomas, and Cooke, the season six ensemble cast includes:
Jack Lowden (River Cartwright)
Saskia Reeves (Catherine Standish)
Christopher Chung (Roddy Ho)
Aimee-Ffion Edwards (Shirley Dander)
Rosalind Eleazar (Louisa Guy)
Joanna Scanlan (Moira Tregorian)
Samuel West (Peter Judd)
Jonathan Pryce (David Cartwright)
Hugo Weaving (Frank Harkness)
Lenny Rush (New Cast Member)
Critical Acclaim & Production
Produced by See-Saw Films, Slow Horses remains one of Apple TV+’s most critically celebrated flagship series, maintaining a Certified Fresh rating on Rotten Tomatoes across all seasons. Season five earned nine Primetime Emmy Award nominations, including Outstanding Drama Series, Outstanding Lead Actor for Gary Oldman, and Outstanding Supporting Actor for Jack Lowden.
Seasons 1 through 5 are currently available to stream in full on Apple TV.
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